Investopedia explains 'Riskless Principal'
For example, a broker-dealer who is a FINRA member and receives a customer order to buy 10,000 shares of Widget Co. at the prevailing market price of $10 would immediately buy the 10,000 shares from another member at $10. Since both trades were executed at the same price (excluding commissions), this would qualify as a riskless principal transaction.
On March 24, 1999, the SEC approved amendments to FINRA, then the National Association of Security Dealers (NASD) rules regarding the reporting of riskless principal transactions by market makers in Nasdaq and OTC securities. The rule change, which was effective Sep. 30, 1999, permitted market makers to only report one leg of a riskless principal transaction, rather than both legs, as was the requirement previously.
While market makers are always deemed to be "at risk" when trading from their principal accounts, the amendment was an acknowledgment of the fact that trades undertaken to offset customer orders are riskless. One of the significant benefits of this rule change was a reduction in transaction fees levied by the SEC.
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